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gecko-dev/gfx/2d/DrawTargetCairo.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DrawTargetCairo.h"
#include "SourceSurfaceCairo.h"
#include "PathCairo.h"
#include "HelpersCairo.h"
#include "ScaledFontBase.h"
#include "BorrowedContext.h"
#include "FilterNodeSoftware.h"
#include "mozilla/Scoped.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Vector.h"
#include "cairo.h"
#include "cairo-tee.h"
#include <string.h>
#include "Blur.h"
#include "Logging.h"
#include "Tools.h"
#ifdef CAIRO_HAS_QUARTZ_SURFACE
#include "cairo-quartz.h"
#ifdef MOZ_WIDGET_COCOA
#include <ApplicationServices/ApplicationServices.h>
#endif
#endif
#ifdef CAIRO_HAS_XLIB_SURFACE
#include "cairo-xlib.h"
#include "cairo-xlib-xrender.h"
#endif
#ifdef CAIRO_HAS_WIN32_SURFACE
#include "cairo-win32.h"
#endif
#define PIXMAN_DONT_DEFINE_STDINT
#include "pixman.h"
#include <algorithm>
// 2^23
#define CAIRO_COORD_MAX (Float(0x7fffff))
namespace mozilla {
MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE(ScopedCairoSurface, cairo_surface_t, cairo_surface_destroy);
namespace gfx {
cairo_surface_t *DrawTargetCairo::mDummySurface;
namespace {
// An RAII class to prepare to draw a context and optional path. Saves and
// restores the context on construction/destruction.
class AutoPrepareForDrawing
{
public:
AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx)
: mCtx(ctx)
{
dt->PrepareForDrawing(ctx);
cairo_save(mCtx);
MOZ_ASSERT(cairo_status(mCtx) || dt->GetTransform() == GetTransform());
}
AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx, const Path* path)
: mCtx(ctx)
{
dt->PrepareForDrawing(ctx, path);
cairo_save(mCtx);
MOZ_ASSERT(cairo_status(mCtx) || dt->GetTransform() == GetTransform());
}
~AutoPrepareForDrawing()
{
cairo_restore(mCtx);
cairo_status_t status = cairo_status(mCtx);
if (status) {
gfxWarning() << "DrawTargetCairo context in error state: " << cairo_status_to_string(status) << "(" << status << ")";
}
}
private:
#ifdef DEBUG
Matrix GetTransform()
{
cairo_matrix_t mat;
cairo_get_matrix(mCtx, &mat);
return Matrix(mat.xx, mat.yx, mat.xy, mat.yy, mat.x0, mat.y0);
}
#endif
cairo_t* mCtx;
};
/* Clamp r to (0,0) (2^23,2^23)
* these are to be device coordinates.
*
* Returns false if the rectangle is completely out of bounds,
* true otherwise.
*
* This function assumes that it will be called with a rectangle being
* drawn into a surface with an identity transformation matrix; that
* is, anything above or to the left of (0,0) will be offscreen.
*
* First it checks if the rectangle is entirely beyond
* CAIRO_COORD_MAX; if so, it can't ever appear on the screen --
* false is returned.
*
* Then it shifts any rectangles with x/y < 0 so that x and y are = 0,
* and adjusts the width and height appropriately. For example, a
* rectangle from (0,-5) with dimensions (5,10) will become a
* rectangle from (0,0) with dimensions (5,5).
*
* If after negative x/y adjustment to 0, either the width or height
* is negative, then the rectangle is completely offscreen, and
* nothing is drawn -- false is returned.
*
* Finally, if x+width or y+height are greater than CAIRO_COORD_MAX,
* the width and height are clamped such x+width or y+height are equal
* to CAIRO_COORD_MAX, and true is returned.
*/
static bool
ConditionRect(Rect& r) {
// if either x or y is way out of bounds;
// note that we don't handle negative w/h here
if (r.X() > CAIRO_COORD_MAX || r.Y() > CAIRO_COORD_MAX)
return false;
if (r.X() < 0.f) {
r.SetWidth(r.XMost());
if (r.Width() < 0.f)
return false;
r.MoveToX(0.f);
}
if (r.XMost() > CAIRO_COORD_MAX) {
r.SetRightEdge(CAIRO_COORD_MAX);
}
if (r.Y() < 0.f) {
r.SetHeight(r.YMost());
if (r.Height() < 0.f)
return false;
r.MoveToY(0.f);
}
if (r.YMost() > CAIRO_COORD_MAX) {
r.SetBottomEdge(CAIRO_COORD_MAX);
}
return true;
}
} // end anonymous namespace
static bool
SupportsSelfCopy(cairo_surface_t* surface)
{
switch (cairo_surface_get_type(surface))
{
#ifdef CAIRO_HAS_QUARTZ_SURFACE
case CAIRO_SURFACE_TYPE_QUARTZ:
return true;
#endif
#ifdef CAIRO_HAS_WIN32_SURFACE
case CAIRO_SURFACE_TYPE_WIN32:
case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
return true;
#endif
default:
return false;
}
}
static bool
PatternIsCompatible(const Pattern& aPattern)
{
switch (aPattern.GetType())
{
case PatternType::LINEAR_GRADIENT:
{
const LinearGradientPattern& pattern = static_cast<const LinearGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BackendType::CAIRO;
}
case PatternType::RADIAL_GRADIENT:
{
const RadialGradientPattern& pattern = static_cast<const RadialGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BackendType::CAIRO;
}
default:
return true;
}
}
static cairo_user_data_key_t surfaceDataKey;
void
ReleaseData(void* aData)
{
DataSourceSurface *data = static_cast<DataSourceSurface*>(aData);
data->Unmap();
data->Release();
}
cairo_surface_t*
CopyToImageSurface(unsigned char *aData,
const IntRect &aRect,
int32_t aStride,
SurfaceFormat aFormat)
{
MOZ_ASSERT(aData);
auto aRectWidth = aRect.Width();
auto aRectHeight = aRect.Height();
cairo_surface_t* surf = cairo_image_surface_create(GfxFormatToCairoFormat(aFormat),
aRectWidth,
aRectHeight);
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (cairo_surface_status(surf)) {
gfxWarning() << "Invalid surface DTC " << cairo_surface_status(surf);
return nullptr;
}
unsigned char* surfData = cairo_image_surface_get_data(surf);
int surfStride = cairo_image_surface_get_stride(surf);
int32_t pixelWidth = BytesPerPixel(aFormat);
unsigned char* source = aData +
aRect.Y() * aStride +
aRect.X() * pixelWidth;
MOZ_ASSERT(aStride >= aRectWidth * pixelWidth);
for (int32_t y = 0; y < aRectHeight; ++y) {
memcpy(surfData + y * surfStride,
source + y * aStride,
aRectWidth * pixelWidth);
}
cairo_surface_mark_dirty(surf);
return surf;
}
/**
* If aSurface can be represented as a surface of type
* CAIRO_SURFACE_TYPE_IMAGE then returns that surface. Does
* not add a reference.
*/
cairo_surface_t* GetAsImageSurface(cairo_surface_t* aSurface)
{
if (cairo_surface_get_type(aSurface) == CAIRO_SURFACE_TYPE_IMAGE) {
return aSurface;
#ifdef CAIRO_HAS_WIN32_SURFACE
} else if (cairo_surface_get_type(aSurface) == CAIRO_SURFACE_TYPE_WIN32) {
return cairo_win32_surface_get_image(aSurface);
#endif
}
return nullptr;
}
cairo_surface_t* CreateSubImageForData(unsigned char* aData,
const IntRect& aRect,
int aStride,
SurfaceFormat aFormat)
{
if (!aData) {
gfxWarning() << "DrawTargetCairo.CreateSubImageForData null aData";
return nullptr;
}
unsigned char *data = aData +
aRect.Y() * aStride +
aRect.X() * BytesPerPixel(aFormat);
cairo_surface_t *image =
cairo_image_surface_create_for_data(data,
GfxFormatToCairoFormat(aFormat),
aRect.Width(),
aRect.Height(),
aStride);
cairo_surface_set_device_offset(image, -aRect.X(), -aRect.Y());
return image;
}
/**
* Returns a referenced cairo_surface_t representing the
* sub-image specified by aSubImage.
*/
cairo_surface_t* ExtractSubImage(cairo_surface_t* aSurface,
const IntRect& aSubImage,
SurfaceFormat aFormat)
{
// No need to worry about retaining a reference to the original
// surface since the only caller of this function guarantees
// that aSurface will stay alive as long as the result
cairo_surface_t* image = GetAsImageSurface(aSurface);
if (image) {
image = CreateSubImageForData(cairo_image_surface_get_data(image),
aSubImage,
cairo_image_surface_get_stride(image),
aFormat);
return image;
}
cairo_surface_t* similar =
cairo_surface_create_similar(aSurface,
cairo_surface_get_content(aSurface),
aSubImage.Width(), aSubImage.Height());
cairo_t* ctx = cairo_create(similar);
cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface(ctx, aSurface, -aSubImage.X(), -aSubImage.Y());
cairo_paint(ctx);
cairo_destroy(ctx);
cairo_surface_set_device_offset(similar, -aSubImage.X(), -aSubImage.Y());
return similar;
}
/**
* Returns cairo surface for the given SourceSurface.
* If possible, it will use the cairo_surface associated with aSurface,
* otherwise, it will create a new cairo_surface.
* In either case, the caller must call cairo_surface_destroy on the
* result when it is done with it.
*/
cairo_surface_t*
GetCairoSurfaceForSourceSurface(SourceSurface *aSurface,
bool aExistingOnly = false,
const IntRect& aSubImage = IntRect())
{
if (!aSurface) {
return nullptr;
}
IntRect subimage = IntRect(IntPoint(), aSurface->GetSize());
if (!aSubImage.IsEmpty()) {
MOZ_ASSERT(!aExistingOnly);
MOZ_ASSERT(subimage.Contains(aSubImage));
subimage = aSubImage;
}
if (aSurface->GetType() == SurfaceType::CAIRO) {
cairo_surface_t* surf = static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface();
if (aSubImage.IsEmpty()) {
cairo_surface_reference(surf);
} else {
surf = ExtractSubImage(surf, subimage, aSurface->GetFormat());
}
return surf;
}
if (aSurface->GetType() == SurfaceType::CAIRO_IMAGE) {
cairo_surface_t* surf =
static_cast<const DataSourceSurfaceCairo*>(aSurface)->GetSurface();
if (aSubImage.IsEmpty()) {
cairo_surface_reference(surf);
} else {
surf = ExtractSubImage(surf, subimage, aSurface->GetFormat());
}
return surf;
}
if (aExistingOnly) {
return nullptr;
}
RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
if (!data) {
return nullptr;
}
DataSourceSurface::MappedSurface map;
if (!data->Map(DataSourceSurface::READ, &map)) {
return nullptr;
}
cairo_surface_t* surf =
CreateSubImageForData(map.mData, subimage,
map.mStride, data->GetFormat());
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (!surf || cairo_surface_status(surf)) {
if (surf && (cairo_surface_status(surf) == CAIRO_STATUS_INVALID_STRIDE)) {
// If we failed because of an invalid stride then copy into
// a new surface with a stride that cairo chooses. No need to
// set user data since we're not dependent on the original
// data.
cairo_surface_t* result =
CopyToImageSurface(map.mData,
subimage,
map.mStride,
data->GetFormat());
data->Unmap();
return result;
}
data->Unmap();
return nullptr;
}
cairo_surface_set_user_data(surf,
&surfaceDataKey,
data.forget().take(),
ReleaseData);
return surf;
}
// An RAII class to temporarily clear any device offset set
// on a surface. Note that this does not take a reference to the
// surface.
class AutoClearDeviceOffset
{
public:
explicit AutoClearDeviceOffset(SourceSurface* aSurface)
: mSurface(nullptr)
, mX(0)
, mY(0)
{
Init(aSurface);
}
explicit AutoClearDeviceOffset(const Pattern& aPattern)
: mSurface(nullptr)
{
if (aPattern.GetType() == PatternType::SURFACE) {
const SurfacePattern& pattern = static_cast<const SurfacePattern&>(aPattern);
Init(pattern.mSurface);
}
}
~AutoClearDeviceOffset()
{
if (mSurface) {
cairo_surface_set_device_offset(mSurface, mX, mY);
}
}
private:
void Init(SourceSurface* aSurface)
{
cairo_surface_t* surface = GetCairoSurfaceForSourceSurface(aSurface, true);
if (surface) {
Init(surface);
cairo_surface_destroy(surface);
}
}
void Init(cairo_surface_t *aSurface)
{
mSurface = aSurface;
cairo_surface_get_device_offset(mSurface, &mX, &mY);
cairo_surface_set_device_offset(mSurface, 0, 0);
}
cairo_surface_t* mSurface;
double mX;
double mY;
};
static inline void
CairoPatternAddGradientStop(cairo_pattern_t* aPattern,
const GradientStop &aStop,
Float aNudge = 0)
{
cairo_pattern_add_color_stop_rgba(aPattern, aStop.offset + aNudge,
aStop.color.r, aStop.color.g, aStop.color.b,
aStop.color.a);
}
// Never returns nullptr. As such, you must always pass in Cairo-compatible
// patterns, most notably gradients with a GradientStopCairo.
// The pattern returned must have cairo_pattern_destroy() called on it by the
// caller.
// As the cairo_pattern_t returned may depend on the Pattern passed in, the
// lifetime of the cairo_pattern_t returned must not exceed the lifetime of the
// Pattern passed in.
static cairo_pattern_t*
GfxPatternToCairoPattern(const Pattern& aPattern,
Float aAlpha,
const Matrix& aTransform)
{
cairo_pattern_t* pat;
const Matrix* matrix = nullptr;
switch (aPattern.GetType())
{
case PatternType::COLOR:
{
Color color = static_cast<const ColorPattern&>(aPattern).mColor;
pat = cairo_pattern_create_rgba(color.r, color.g, color.b, color.a * aAlpha);
break;
}
case PatternType::SURFACE:
{
const SurfacePattern& pattern = static_cast<const SurfacePattern&>(aPattern);
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(pattern.mSurface,
false,
pattern.mSamplingRect);
if (!surf)
return nullptr;
pat = cairo_pattern_create_for_surface(surf);
matrix = &pattern.mMatrix;
cairo_pattern_set_filter(pat, GfxSamplingFilterToCairoFilter(pattern.mSamplingFilter));
cairo_pattern_set_extend(pat, GfxExtendToCairoExtend(pattern.mExtendMode));
cairo_surface_destroy(surf);
break;
}
case PatternType::LINEAR_GRADIENT:
{
const LinearGradientPattern& pattern = static_cast<const LinearGradientPattern&>(aPattern);
pat = cairo_pattern_create_linear(pattern.mBegin.x, pattern.mBegin.y,
pattern.mEnd.x, pattern.mEnd.y);
MOZ_ASSERT(pattern.mStops->GetBackendType() == BackendType::CAIRO);
GradientStopsCairo* cairoStops = static_cast<GradientStopsCairo*>(pattern.mStops.get());
cairo_pattern_set_extend(pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
matrix = &pattern.mMatrix;
const std::vector<GradientStop>& stops = cairoStops->GetStops();
for (size_t i = 0; i < stops.size(); ++i) {
CairoPatternAddGradientStop(pat, stops[i]);
}
break;
}
case PatternType::RADIAL_GRADIENT:
{
const RadialGradientPattern& pattern = static_cast<const RadialGradientPattern&>(aPattern);
pat = cairo_pattern_create_radial(pattern.mCenter1.x, pattern.mCenter1.y, pattern.mRadius1,
pattern.mCenter2.x, pattern.mCenter2.y, pattern.mRadius2);
MOZ_ASSERT(pattern.mStops->GetBackendType() == BackendType::CAIRO);
GradientStopsCairo* cairoStops = static_cast<GradientStopsCairo*>(pattern.mStops.get());
cairo_pattern_set_extend(pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
matrix = &pattern.mMatrix;
const std::vector<GradientStop>& stops = cairoStops->GetStops();
for (size_t i = 0; i < stops.size(); ++i) {
CairoPatternAddGradientStop(pat, stops[i]);
}
break;
}
default:
{
// We should support all pattern types!
MOZ_ASSERT(false);
}
}
// The pattern matrix is a matrix that transforms the pattern into user
// space. Cairo takes a matrix that converts from user space to pattern
// space. Cairo therefore needs the inverse.
if (matrix) {
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(*matrix, mat);
cairo_matrix_invert(&mat);
cairo_pattern_set_matrix(pat, &mat);
}
return pat;
}
static bool
NeedIntermediateSurface(const Pattern& aPattern, const DrawOptions& aOptions)
{
// We pre-multiply colours' alpha by the global alpha, so we don't need to
// use an intermediate surface for them.
if (aPattern.GetType() == PatternType::COLOR)
return false;
if (aOptions.mAlpha == 1.0)
return false;
return true;
}
DrawTargetCairo::DrawTargetCairo()
: mContext(nullptr)
, mSurface(nullptr)
, mTransformSingular(false)
, mLockedBits(nullptr)
, mFontOptions(nullptr)
{
}
DrawTargetCairo::~DrawTargetCairo()
{
cairo_destroy(mContext);
if (mSurface) {
cairo_surface_destroy(mSurface);
mSurface = nullptr;
}
if (mFontOptions) {
cairo_font_options_destroy(mFontOptions);
mFontOptions = nullptr;
}
MOZ_ASSERT(!mLockedBits);
}
bool
DrawTargetCairo::IsValid() const
{
return mSurface && !cairo_surface_status(mSurface) &&
mContext && !cairo_surface_status(cairo_get_group_target(mContext));
}
DrawTargetType
DrawTargetCairo::GetType() const
{
if (mContext) {
cairo_surface_type_t type = cairo_surface_get_type(mSurface);
if (type == CAIRO_SURFACE_TYPE_TEE) {
type = cairo_surface_get_type(cairo_tee_surface_index(mSurface, 0));
MOZ_ASSERT(type != CAIRO_SURFACE_TYPE_TEE, "C'mon!");
MOZ_ASSERT(type == cairo_surface_get_type(cairo_tee_surface_index(mSurface, 1)),
"What should we do here?");
}
switch (type) {
case CAIRO_SURFACE_TYPE_PDF:
case CAIRO_SURFACE_TYPE_PS:
case CAIRO_SURFACE_TYPE_SVG:
case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
case CAIRO_SURFACE_TYPE_XML:
return DrawTargetType::VECTOR;
case CAIRO_SURFACE_TYPE_VG:
case CAIRO_SURFACE_TYPE_GL:
case CAIRO_SURFACE_TYPE_GLITZ:
case CAIRO_SURFACE_TYPE_QUARTZ:
case CAIRO_SURFACE_TYPE_DIRECTFB:
return DrawTargetType::HARDWARE_RASTER;
case CAIRO_SURFACE_TYPE_SKIA:
case CAIRO_SURFACE_TYPE_QT:
MOZ_FALLTHROUGH_ASSERT("Can't determine actual DrawTargetType for DrawTargetCairo - assuming SOFTWARE_RASTER");
case CAIRO_SURFACE_TYPE_IMAGE:
case CAIRO_SURFACE_TYPE_XLIB:
case CAIRO_SURFACE_TYPE_XCB:
case CAIRO_SURFACE_TYPE_WIN32:
case CAIRO_SURFACE_TYPE_BEOS:
case CAIRO_SURFACE_TYPE_OS2:
case CAIRO_SURFACE_TYPE_QUARTZ_IMAGE:
case CAIRO_SURFACE_TYPE_SCRIPT:
case CAIRO_SURFACE_TYPE_RECORDING:
case CAIRO_SURFACE_TYPE_DRM:
case CAIRO_SURFACE_TYPE_SUBSURFACE:
case CAIRO_SURFACE_TYPE_TEE: // included to silence warning about unhandled enum value
return DrawTargetType::SOFTWARE_RASTER;
default:
MOZ_CRASH("GFX: Unsupported cairo surface type");
}
}
MOZ_ASSERT(false, "Could not determine DrawTargetType for DrawTargetCairo");
return DrawTargetType::SOFTWARE_RASTER;
}
IntSize
DrawTargetCairo::GetSize()
{
return mSize;
}
SurfaceFormat
GfxFormatForCairoSurface(cairo_surface_t* surface)
{
cairo_surface_type_t type = cairo_surface_get_type(surface);
if (type == CAIRO_SURFACE_TYPE_IMAGE) {
return CairoFormatToGfxFormat(cairo_image_surface_get_format(surface));
}
#ifdef CAIRO_HAS_XLIB_SURFACE
// xlib is currently the only Cairo backend that creates 16bpp surfaces
if (type == CAIRO_SURFACE_TYPE_XLIB &&
cairo_xlib_surface_get_depth(surface) == 16) {
return SurfaceFormat::R5G6B5_UINT16;
}
#endif
return CairoContentToGfxFormat(cairo_surface_get_content(surface));
}
already_AddRefed<SourceSurface>
DrawTargetCairo::Snapshot()
{
if (!IsValid()) {
gfxCriticalNote << "DrawTargetCairo::Snapshot with bad surface " << hexa(mSurface)
<< ", context " << hexa(mContext)
<< ", status " << (mSurface ? cairo_surface_status(mSurface) : -1);
return nullptr;
}
if (mSnapshot) {
RefPtr<SourceSurface> snapshot(mSnapshot);
return snapshot.forget();
}
IntSize size = GetSize();
mSnapshot = new SourceSurfaceCairo(mSurface,
size,
GfxFormatForCairoSurface(mSurface),
this);
RefPtr<SourceSurface> snapshot(mSnapshot);
return snapshot.forget();
}
bool
DrawTargetCairo::LockBits(uint8_t** aData, IntSize* aSize,
int32_t* aStride, SurfaceFormat* aFormat,
IntPoint* aOrigin)
{
cairo_surface_t* target = cairo_get_group_target(mContext);
cairo_surface_t* surf = target;
#ifdef CAIRO_HAS_WIN32_SURFACE
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_WIN32) {
cairo_surface_t* imgsurf = cairo_win32_surface_get_image(surf);
if (imgsurf) {
surf = imgsurf;
}
}
#endif
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_IMAGE &&
cairo_surface_status(surf) == CAIRO_STATUS_SUCCESS) {
PointDouble offset;
cairo_surface_get_device_offset(target, &offset.x, &offset.y);
// verify the device offset can be converted to integers suitable for a bounds rect
IntPoint origin(int32_t(-offset.x), int32_t(-offset.y));
if (-PointDouble(origin) != offset ||
(!aOrigin && origin != IntPoint())) {
return false;
}
WillChange();
Flush();
mLockedBits = cairo_image_surface_get_data(surf);
*aData = mLockedBits;
*aSize = IntSize(cairo_image_surface_get_width(surf),
cairo_image_surface_get_height(surf));
*aStride = cairo_image_surface_get_stride(surf);
*aFormat = CairoFormatToGfxFormat(cairo_image_surface_get_format(surf));
if (aOrigin) {
*aOrigin = origin;
}
return true;
}
return false;
}
void
DrawTargetCairo::ReleaseBits(uint8_t* aData)
{
MOZ_ASSERT(mLockedBits == aData);
mLockedBits = nullptr;
cairo_surface_t* surf = cairo_get_group_target(mContext);
#ifdef CAIRO_HAS_WIN32_SURFACE
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_WIN32) {
cairo_surface_t* imgsurf = cairo_win32_surface_get_image(surf);
if (imgsurf) {
cairo_surface_mark_dirty(imgsurf);
}
}
#endif
cairo_surface_mark_dirty(surf);
}
void
DrawTargetCairo::Flush()
{
cairo_surface_t* surf = cairo_get_group_target(mContext);
cairo_surface_flush(surf);
}
void
DrawTargetCairo::PrepareForDrawing(cairo_t* aContext, const Path* aPath /* = nullptr */)
{
WillChange(aPath);
}
cairo_surface_t*
DrawTargetCairo::GetDummySurface()
{
if (mDummySurface) {
return mDummySurface;
}
mDummySurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
return mDummySurface;
}
static void
PaintWithAlpha(cairo_t* aContext, const DrawOptions& aOptions)
{
if (aOptions.mCompositionOp == CompositionOp::OP_SOURCE) {
// Cairo treats the source operator like a lerp when alpha is < 1.
// Approximate the desired operator by: out = 0; out += src*alpha;
if (aOptions.mAlpha == 1) {
cairo_set_operator(aContext, CAIRO_OPERATOR_SOURCE);
cairo_paint(aContext);
} else {
cairo_set_operator(aContext, CAIRO_OPERATOR_CLEAR);
cairo_paint(aContext);
cairo_set_operator(aContext, CAIRO_OPERATOR_ADD);
cairo_paint_with_alpha(aContext, aOptions.mAlpha);
}
} else {
cairo_set_operator(aContext, GfxOpToCairoOp(aOptions.mCompositionOp));
cairo_paint_with_alpha(aContext, aOptions.mAlpha);
}
}
void
DrawTargetCairo::DrawSurface(SourceSurface *aSurface,
const Rect &aDest,
const Rect &aSource,
const DrawSurfaceOptions &aSurfOptions,
const DrawOptions &aOptions)
{
if (mTransformSingular || aDest.IsEmpty()) {
return;
}
if (!IsValid() || !aSurface) {
gfxCriticalNote << "DrawSurface with bad surface " << cairo_surface_status(cairo_get_group_target(mContext));
return;
}
AutoPrepareForDrawing prep(this, mContext);
AutoClearDeviceOffset clear(aSurface);
float sx = aSource.Width() / aDest.Width();
float sy = aSource.Height() / aDest.Height();
cairo_matrix_t src_mat;
cairo_matrix_init_translate(&src_mat, aSource.X(), aSource.Y());
cairo_matrix_scale(&src_mat, sx, sy);
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aSurface);
if (!surf) {
gfxWarning() << "Failed to create cairo surface for DrawTargetCairo::DrawSurface";
return;
}
cairo_pattern_t* pat = cairo_pattern_create_for_surface(surf);
cairo_surface_destroy(surf);
cairo_pattern_set_matrix(pat, &src_mat);
cairo_pattern_set_filter(pat, GfxSamplingFilterToCairoFilter(aSurfOptions.mSamplingFilter));
cairo_pattern_set_extend(pat, CAIRO_EXTEND_PAD);
cairo_set_antialias(mContext, GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
// If the destination rect covers the entire clipped area, then unbounded and bounded
// operations are identical, and we don't need to push a group.
bool needsGroup = !IsOperatorBoundByMask(aOptions.mCompositionOp) &&
!aDest.Contains(GetUserSpaceClip());
cairo_translate(mContext, aDest.X(), aDest.Y());
if (needsGroup) {
cairo_push_group(mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
cairo_set_source(mContext, pat);
cairo_fill(mContext);
cairo_pop_group_to_source(mContext);
} else {
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
cairo_clip(mContext);
cairo_set_source(mContext, pat);
}
PaintWithAlpha(mContext, aOptions);
cairo_pattern_destroy(pat);
}
void
DrawTargetCairo::DrawFilter(FilterNode *aNode,
const Rect &aSourceRect,
const Point &aDestPoint,
const DrawOptions &aOptions)
{
FilterNodeSoftware* filter = static_cast<FilterNodeSoftware*>(aNode);
filter->Draw(this, aSourceRect, aDestPoint, aOptions);
}
void
DrawTargetCairo::DrawSurfaceWithShadow(SourceSurface *aSurface,
const Point &aDest,
const Color &aColor,
const Point &aOffset,
Float aSigma,
CompositionOp aOperator)
{
if (aSurface->GetType() != SurfaceType::CAIRO) {
return;
}
AutoClearDeviceOffset clear(aSurface);
Float width = Float(aSurface->GetSize().width);
Float height = Float(aSurface->GetSize().height);
SourceSurfaceCairo* source = static_cast<SourceSurfaceCairo*>(aSurface);
cairo_surface_t* sourcesurf = source->GetSurface();
cairo_surface_t* blursurf;
cairo_surface_t* surf;
// We only use the A8 surface for blurred shadows. Unblurred shadows can just
// use the RGBA surface directly.
if (cairo_surface_get_type(sourcesurf) == CAIRO_SURFACE_TYPE_TEE) {
blursurf = cairo_tee_surface_index(sourcesurf, 0);
surf = cairo_tee_surface_index(sourcesurf, 1);
} else {
blursurf = sourcesurf;
surf = sourcesurf;
}
if (aSigma != 0.0f) {
MOZ_ASSERT(cairo_surface_get_type(blursurf) == CAIRO_SURFACE_TYPE_IMAGE);
Rect extents(0, 0, width, height);
AlphaBoxBlur blur(extents,
cairo_image_surface_get_stride(blursurf),
aSigma, aSigma);
blur.Blur(cairo_image_surface_get_data(blursurf));
}
WillChange();
ClearSurfaceForUnboundedSource(aOperator);
cairo_save(mContext);
cairo_set_operator(mContext, GfxOpToCairoOp(aOperator));
cairo_identity_matrix(mContext);
cairo_translate(mContext, aDest.x, aDest.y);
bool needsGroup = !IsOperatorBoundByMask(aOperator);
if (needsGroup) {
cairo_push_group(mContext);
}
cairo_set_source_rgba(mContext, aColor.r, aColor.g, aColor.b, aColor.a);
cairo_mask_surface(mContext, blursurf, aOffset.x, aOffset.y);
if (blursurf != surf ||
aSurface->GetFormat() != SurfaceFormat::A8) {
// Now that the shadow has been drawn, we can draw the surface on top.
cairo_set_source_surface(mContext, surf, 0, 0);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, width, height);
cairo_fill(mContext);
}
if (needsGroup) {
cairo_pop_group_to_source(mContext);
cairo_paint(mContext);
}
cairo_restore(mContext);
}
void
DrawTargetCairo::DrawPattern(const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions,
DrawPatternType aDrawType,
bool aPathBoundsClip)
{
if (!PatternIsCompatible(aPattern)) {
return;
}
AutoClearDeviceOffset clear(aPattern);
cairo_pattern_t* pat = GfxPatternToCairoPattern(aPattern, aOptions.mAlpha, GetTransform());
if (!pat) {
return;
}
if (cairo_pattern_status(pat)) {
cairo_pattern_destroy(pat);
gfxWarning() << "Invalid pattern";
return;
}
cairo_set_source(mContext, pat);
cairo_set_antialias(mContext, GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
if (NeedIntermediateSurface(aPattern, aOptions) ||
(!IsOperatorBoundByMask(aOptions.mCompositionOp) && !aPathBoundsClip)) {
cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
// Don't want operators to be applied twice
cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
if (aDrawType == DRAW_STROKE) {
SetCairoStrokeOptions(mContext, aStrokeOptions);
cairo_stroke_preserve(mContext);
} else {
cairo_fill_preserve(mContext);
}
cairo_pop_group_to_source(mContext);
// Now draw the content using the desired operator
PaintWithAlpha(mContext, aOptions);
} else {
cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
if (aDrawType == DRAW_STROKE) {
SetCairoStrokeOptions(mContext, aStrokeOptions);
cairo_stroke_preserve(mContext);
} else {
cairo_fill_preserve(mContext);
}
}
cairo_pattern_destroy(pat);
}
void
DrawTargetCairo::FillRect(const Rect &aRect,
const Pattern &aPattern,
const DrawOptions &aOptions)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
bool restoreTransform = false;
Matrix mat;
Rect r = aRect;
/* Clamp coordinates to work around a design bug in cairo */
if (r.Width() > CAIRO_COORD_MAX ||
r.Height() > CAIRO_COORD_MAX ||
r.X() < -CAIRO_COORD_MAX ||
r.X() > CAIRO_COORD_MAX ||
r.Y() < -CAIRO_COORD_MAX ||
r.Y() > CAIRO_COORD_MAX)
{
if (!mat.IsRectilinear()) {
gfxWarning() << "DrawTargetCairo::FillRect() misdrawing huge Rect "
"with non-rectilinear transform";
}
mat = GetTransform();
r = mat.TransformBounds(r);
if (!ConditionRect(r)) {
gfxWarning() << "Ignoring DrawTargetCairo::FillRect() call with "
"out-of-bounds Rect";
return;
}
restoreTransform = true;
SetTransform(Matrix());
}
cairo_new_path(mContext);
cairo_rectangle(mContext, r.X(), r.Y(), r.Width(), r.Height());
bool pathBoundsClip = false;
if (r.Contains(GetUserSpaceClip())) {
pathBoundsClip = true;
}
DrawPattern(aPattern, StrokeOptions(), aOptions, DRAW_FILL, pathBoundsClip);
if (restoreTransform) {
SetTransform(mat);
}
}
void
DrawTargetCairo::CopySurfaceInternal(cairo_surface_t* aSurface,
const IntRect &aSource,
const IntPoint &aDest)
{
if (cairo_surface_status(aSurface)) {
gfxWarning() << "Invalid surface" << cairo_surface_status(aSurface);
return;
}
cairo_identity_matrix(mContext);
cairo_set_source_surface(mContext, aSurface, aDest.x - aSource.X(), aDest.y - aSource.Y());
cairo_set_operator(mContext, CAIRO_OPERATOR_SOURCE);
cairo_set_antialias(mContext, CAIRO_ANTIALIAS_NONE);
cairo_reset_clip(mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, aDest.x, aDest.y, aSource.Width(), aSource.Height());
cairo_fill(mContext);
}
void
DrawTargetCairo::CopySurface(SourceSurface *aSurface,
const IntRect &aSource,
const IntPoint &aDest)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
AutoClearDeviceOffset clear(aSurface);
if (!aSurface) {
gfxWarning() << "Unsupported surface type specified";
return;
}
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aSurface);
if (!surf) {
gfxWarning() << "Unsupported surface type specified";
return;
}
CopySurfaceInternal(surf, aSource, aDest);
cairo_surface_destroy(surf);
}
void
DrawTargetCairo::CopyRect(const IntRect &aSource,
const IntPoint &aDest)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
IntRect source = aSource;
cairo_surface_t* surf = mSurface;
if (!SupportsSelfCopy(mSurface) &&
aSource.ContainsY(aDest.y)) {
cairo_surface_t* similar = cairo_surface_create_similar(mSurface,
GfxFormatToCairoContent(GetFormat()),
aSource.Width(), aSource.Height());
cairo_t* ctx = cairo_create(similar);
cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface(ctx, surf, -aSource.X(), -aSource.Y());
cairo_paint(ctx);
cairo_destroy(ctx);
source.MoveTo(0, 0);
surf = similar;
}
CopySurfaceInternal(surf, source, aDest);
if (surf != mSurface) {
cairo_surface_destroy(surf);
}
}
void
DrawTargetCairo::ClearRect(const Rect& aRect)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
if (!mContext || aRect.Width() < 0 || aRect.Height() < 0 ||
!IsFinite(aRect.X()) || !IsFinite(aRect.Width()) ||
!IsFinite(aRect.Y()) || !IsFinite(aRect.Height())) {
gfxCriticalNote << "ClearRect with invalid argument " << gfx::hexa(mContext) << " with " << aRect.Width() << "x" << aRect.Height() << " [" << aRect.X() << ", " << aRect.Y() << "]";
}
cairo_set_antialias(mContext, CAIRO_ANTIALIAS_NONE);
cairo_new_path(mContext);
cairo_set_operator(mContext, CAIRO_OPERATOR_CLEAR);
cairo_rectangle(mContext, aRect.X(), aRect.Y(),
aRect.Width(), aRect.Height());
cairo_fill(mContext);
}
void
DrawTargetCairo::StrokeRect(const Rect &aRect,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions /* = StrokeOptions() */,
const DrawOptions &aOptions /* = DrawOptions() */)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
}
void
DrawTargetCairo::StrokeLine(const Point &aStart,
const Point &aEnd,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions /* = StrokeOptions() */,
const DrawOptions &aOptions /* = DrawOptions() */)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
cairo_new_path(mContext);
cairo_move_to(mContext, aStart.x, aStart.y);
cairo_line_to(mContext, aEnd.x, aEnd.y);
DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
}
void
DrawTargetCairo::Stroke(const Path *aPath,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions /* = StrokeOptions() */,
const DrawOptions &aOptions /* = DrawOptions() */)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext, aPath);
if (aPath->GetBackendType() != BackendType::CAIRO)
return;
PathCairo* path = const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
path->SetPathOnContext(mContext);
DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
}
void
DrawTargetCairo::Fill(const Path *aPath,
const Pattern &aPattern,
const DrawOptions &aOptions /* = DrawOptions() */)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext, aPath);
if (aPath->GetBackendType() != BackendType::CAIRO)
return;
PathCairo* path = const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
path->SetPathOnContext(mContext);
DrawPattern(aPattern, StrokeOptions(), aOptions, DRAW_FILL);
}
bool
DrawTargetCairo::IsCurrentGroupOpaque()
{
cairo_surface_t* surf = cairo_get_group_target(mContext);
if (!surf) {
return false;
}
return cairo_surface_get_content(surf) == CAIRO_CONTENT_COLOR;
}
void
DrawTargetCairo::SetFontOptions()
{
// This will attempt to detect if the currently set scaled font on the
// context has enabled subpixel AA. If it is not permitted, then it will
// downgrade to grayscale AA.
// This only currently works effectively for the cairo-ft backend relative
// to system defaults, as only cairo-ft reflect system defaults in the scaled
// font state. However, this will work for cairo-ft on both tree Cairo and
// system Cairo.
// Other backends leave the CAIRO_ANTIALIAS_DEFAULT setting untouched while
// potentially interpreting it as subpixel or even other types of AA that
// can't be safely equivocated with grayscale AA. For this reason we don't
// try to also detect and modify the default AA setting, only explicit
// subpixel AA. These other backends must instead rely on tree Cairo's
// cairo_surface_set_subpixel_antialiasing extension.
// If allowing subpixel AA, then leave Cairo's default AA state.
if (mPermitSubpixelAA) {
return;
}
if (!mFontOptions) {
mFontOptions = cairo_font_options_create();
if (!mFontOptions) {
gfxWarning() << "Failed allocating Cairo font options";
return;
}
}
// If the current font requests subpixel AA, force it to gray since we don't
// allow subpixel AA.
cairo_get_font_options(mContext, mFontOptions);
cairo_antialias_t antialias = cairo_font_options_get_antialias(mFontOptions);
if (antialias == CAIRO_ANTIALIAS_SUBPIXEL) {
cairo_font_options_set_antialias(mFontOptions, CAIRO_ANTIALIAS_GRAY);
cairo_set_font_options(mContext, mFontOptions);
}
}
void
DrawTargetCairo::SetPermitSubpixelAA(bool aPermitSubpixelAA)
{
DrawTarget::SetPermitSubpixelAA(aPermitSubpixelAA);
#ifdef MOZ_TREE_CAIRO
cairo_surface_set_subpixel_antialiasing(cairo_get_group_target(mContext),
aPermitSubpixelAA ? CAIRO_SUBPIXEL_ANTIALIASING_ENABLED : CAIRO_SUBPIXEL_ANTIALIASING_DISABLED);
#endif
}
void
DrawTargetCairo::FillGlyphs(ScaledFont *aFont,
const GlyphBuffer &aBuffer,
const Pattern &aPattern,
const DrawOptions &aOptions)
{
if (mTransformSingular) {
return;
}
if (!IsValid()) {
gfxDebug() << "FillGlyphs bad surface " << cairo_surface_status(cairo_get_group_target(mContext));
return;
}
if (!aFont) {
gfxDevCrash(LogReason::InvalidFont) << "Invalid scaled font";
return;
}
AutoPrepareForDrawing prep(this, mContext);
AutoClearDeviceOffset clear(aPattern);
ScaledFontBase* scaledFont = static_cast<ScaledFontBase*>(aFont);
cairo_set_scaled_font(mContext, scaledFont->GetCairoScaledFont());
cairo_pattern_t* pat = GfxPatternToCairoPattern(aPattern, aOptions.mAlpha, GetTransform());
if (!pat)
return;
cairo_set_source(mContext, pat);
cairo_pattern_destroy(pat);
cairo_set_antialias(mContext, GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
// Override any font-specific options as necessary.
SetFontOptions();
// Convert our GlyphBuffer into a vector of Cairo glyphs. This code can
// execute millions of times in short periods, so we want to avoid heap
// allocation whenever possible. So we use an inline vector capacity of 1024
// bytes (the maximum allowed by mozilla::Vector), which gives an inline
// length of 1024 / 24 = 42 elements, which is enough to typically avoid heap
// allocation in ~99% of cases.
Vector<cairo_glyph_t, 1024 / sizeof(cairo_glyph_t)> glyphs;
if (!glyphs.resizeUninitialized(aBuffer.mNumGlyphs)) {
gfxDevCrash(LogReason::GlyphAllocFailedCairo) << "glyphs allocation failed";
return;
}
for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
}
cairo_show_glyphs(mContext, &glyphs[0], aBuffer.mNumGlyphs);
if (cairo_surface_status(cairo_get_group_target(mContext))) {
gfxDebug() << "Ending FillGlyphs with a bad surface " << cairo_surface_status(cairo_get_group_target(mContext));
}
}
void
DrawTargetCairo::Mask(const Pattern &aSource,
const Pattern &aMask,
const DrawOptions &aOptions /* = DrawOptions() */)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
AutoClearDeviceOffset clearSource(aSource);
AutoClearDeviceOffset clearMask(aMask);
cairo_set_antialias(mContext, GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
cairo_pattern_t* source = GfxPatternToCairoPattern(aSource, aOptions.mAlpha, GetTransform());
if (!source) {
return;
}
cairo_pattern_t* mask = GfxPatternToCairoPattern(aMask, aOptions.mAlpha, GetTransform());
if (!mask) {
cairo_pattern_destroy(source);
return;
}
if (cairo_pattern_status(source) || cairo_pattern_status(mask)) {
cairo_pattern_destroy(source);
cairo_pattern_destroy(mask);
gfxWarning() << "Invalid pattern";
return;
}
cairo_set_source(mContext, source);
cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
cairo_mask(mContext, mask);
cairo_pattern_destroy(mask);
cairo_pattern_destroy(source);
}
void
DrawTargetCairo::MaskSurface(const Pattern &aSource,
SourceSurface *aMask,
Point aOffset,
const DrawOptions &aOptions)
{
if (mTransformSingular) {
return;
}
AutoPrepareForDrawing prep(this, mContext);
AutoClearDeviceOffset clearSource(aSource);
AutoClearDeviceOffset clearMask(aMask);
if (!PatternIsCompatible(aSource)) {
return;
}
cairo_set_antialias(mContext, GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
cairo_pattern_t* pat = GfxPatternToCairoPattern(aSource, aOptions.mAlpha, GetTransform());
if (!pat) {
return;
}
if (cairo_pattern_status(pat)) {
cairo_pattern_destroy(pat);
gfxWarning() << "Invalid pattern";
return;
}
cairo_set_source(mContext, pat);
if (NeedIntermediateSurface(aSource, aOptions)) {
cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
// Don't want operators to be applied twice
cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
// Now draw the content using the desired operator
cairo_paint_with_alpha(mContext, aOptions.mAlpha);
cairo_pop_group_to_source(mContext);
}
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aMask);
if (!surf) {
cairo_pattern_destroy(pat);
return;
}
cairo_pattern_t* mask = cairo_pattern_create_for_surface(surf);
cairo_matrix_t matrix;
cairo_matrix_init_translate (&matrix, -aOffset.x, -aOffset.y);
cairo_pattern_set_matrix (mask, &matrix);
cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
cairo_mask(mContext, mask);
cairo_surface_destroy(surf);
cairo_pattern_destroy(mask);
cairo_pattern_destroy(pat);
}
void
DrawTargetCairo::PushClip(const Path *aPath)
{
if (aPath->GetBackendType() != BackendType::CAIRO) {
return;
}
WillChange(aPath);
cairo_save(mContext);
PathCairo* path = const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
if (mTransformSingular) {
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, 0, 0);
} else {
path->SetPathOnContext(mContext);
}
cairo_clip_preserve(mContext);
}
void
DrawTargetCairo::PushClipRect(const Rect& aRect)
{
WillChange();
cairo_save(mContext);
cairo_new_path(mContext);
if (mTransformSingular) {
cairo_rectangle(mContext, 0, 0, 0, 0);
} else {
cairo_rectangle(mContext, aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
}
cairo_clip_preserve(mContext);
}
void
DrawTargetCairo::PopClip()
{
// save/restore does not affect the path, so no need to call WillChange()
// cairo_restore will restore the transform too and we don't want to do that
// so we'll save it now and restore it after the cairo_restore
cairo_matrix_t mat;
cairo_get_matrix(mContext, &mat);
cairo_restore(mContext);
cairo_set_matrix(mContext, &mat);
}
void
DrawTargetCairo::PushLayer(bool aOpaque, Float aOpacity, SourceSurface* aMask,
const Matrix& aMaskTransform, const IntRect& aBounds,
bool aCopyBackground)
{
cairo_content_t content = CAIRO_CONTENT_COLOR_ALPHA;
if (mFormat == SurfaceFormat::A8) {
content = CAIRO_CONTENT_ALPHA;
} else if (aOpaque) {
content = CAIRO_CONTENT_COLOR;
}
if (aCopyBackground) {
cairo_surface_t* source = cairo_get_group_target(mContext);
cairo_push_group_with_content(mContext, content);
cairo_surface_t* dest = cairo_get_group_target(mContext);
cairo_t* ctx = cairo_create(dest);
cairo_set_source_surface(ctx, source, 0, 0);
cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
cairo_paint(ctx);
cairo_destroy(ctx);
} else {
cairo_push_group_with_content(mContext, content);
}
PushedLayer layer(aOpacity, mPermitSubpixelAA);
if (aMask) {
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aMask);
if (surf) {
layer.mMaskPattern = cairo_pattern_create_for_surface(surf);
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(aMaskTransform, mat);
cairo_matrix_invert(&mat);
cairo_pattern_set_matrix(layer.mMaskPattern, &mat);
cairo_surface_destroy(surf);
} else {
gfxCriticalError() << "Failed to get cairo surface for mask surface!";
}
}
mPushedLayers.push_back(layer);
SetPermitSubpixelAA(aOpaque);
}
void
DrawTargetCairo::PopLayer()
{
MOZ_ASSERT(mPushedLayers.size());
cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
cairo_pop_group_to_source(mContext);
PushedLayer layer = mPushedLayers.back();
mPushedLayers.pop_back();
if (!layer.mMaskPattern) {
cairo_paint_with_alpha(mContext, layer.mOpacity);
} else {
if (layer.mOpacity != Float(1.0)) {
cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
// Now draw the content using the desired operator
cairo_paint_with_alpha(mContext, layer.mOpacity);
cairo_pop_group_to_source(mContext);
}
cairo_mask(mContext, layer.mMaskPattern);
}
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(mTransform, mat);
cairo_set_matrix(mContext, &mat);
cairo_pattern_destroy(layer.mMaskPattern);
SetPermitSubpixelAA(layer.mWasPermittingSubpixelAA);
}
already_AddRefed<PathBuilder>
DrawTargetCairo::CreatePathBuilder(FillRule aFillRule /* = FillRule::FILL_WINDING */) const
{
return MakeAndAddRef<PathBuilderCairo>(aFillRule);
}
void
DrawTargetCairo::ClearSurfaceForUnboundedSource(const CompositionOp &aOperator)
{
if (aOperator != CompositionOp::OP_SOURCE)
return;
cairo_set_operator(mContext, CAIRO_OPERATOR_CLEAR);
// It doesn't really matter what the source is here, since Paint
// isn't bounded by the source and the mask covers the entire clip
// region.
cairo_paint(mContext);
}
already_AddRefed<GradientStops>
DrawTargetCairo::CreateGradientStops(GradientStop *aStops, uint32_t aNumStops,
ExtendMode aExtendMode) const
{
return MakeAndAddRef<GradientStopsCairo>(aStops, aNumStops, aExtendMode);
}
already_AddRefed<FilterNode>
DrawTargetCairo::CreateFilter(FilterType aType)
{
return FilterNodeSoftware::Create(aType);
}
void
DrawTargetCairo::GetGlyphRasterizationMetrics(ScaledFont *aScaledFont, const uint16_t* aGlyphIndices,
uint32_t aNumGlyphs, GlyphMetrics* aGlyphMetrics)
{
for (uint32_t i = 0; i < aNumGlyphs; i++) {
cairo_glyph_t glyph;
cairo_text_extents_t extents;
glyph.index = aGlyphIndices[i];
glyph.x = 0;
glyph.y = 0;
cairo_glyph_extents(mContext, &glyph, 1, &extents);
aGlyphMetrics[i].mXBearing = extents.x_bearing;
aGlyphMetrics[i].mXAdvance = extents.x_advance;
aGlyphMetrics[i].mYBearing = extents.y_bearing;
aGlyphMetrics[i].mYAdvance = extents.y_advance;
aGlyphMetrics[i].mWidth = extents.width;
aGlyphMetrics[i].mHeight = extents.height;
}
}
already_AddRefed<SourceSurface>
DrawTargetCairo::CreateSourceSurfaceFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat) const
{
if (!aData) {
gfxWarning() << "DrawTargetCairo::CreateSourceSurfaceFromData null aData";
return nullptr;
}
cairo_surface_t* surf = CopyToImageSurface(aData, IntRect(IntPoint(), aSize),
aStride, aFormat);
if (!surf) {
return nullptr;
}
RefPtr<SourceSurfaceCairo> source_surf = new SourceSurfaceCairo(surf, aSize, aFormat);
cairo_surface_destroy(surf);
return source_surf.forget();
}
#ifdef CAIRO_HAS_XLIB_SURFACE
static cairo_user_data_key_t gDestroyPixmapKey;
struct DestroyPixmapClosure {
DestroyPixmapClosure(Drawable d, Screen *s) : mPixmap(d), mScreen(s) {}
~DestroyPixmapClosure() {
XFreePixmap(DisplayOfScreen(mScreen), mPixmap);
}
Drawable mPixmap;
Screen *mScreen;
};
static void
DestroyPixmap(void *data)
{
delete static_cast<DestroyPixmapClosure*>(data);
}
#endif
already_AddRefed<SourceSurface>
DrawTargetCairo::OptimizeSourceSurface(SourceSurface *aSurface) const
{
RefPtr<SourceSurface> surface(aSurface);
#ifdef CAIRO_HAS_XLIB_SURFACE
cairo_surface_type_t ctype = cairo_surface_get_type(mSurface);
if (aSurface->GetType() == SurfaceType::CAIRO &&
cairo_surface_get_type(
static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface()) == ctype) {
return surface.forget();
}
if (ctype != CAIRO_SURFACE_TYPE_XLIB) {
return surface.forget();
}
IntSize size = aSurface->GetSize();
if (!size.width || !size.height) {
return surface.forget();
}
// Although the dimension parameters in the xCreatePixmapReq wire protocol are
// 16-bit unsigned integers, the server's CreatePixmap returns BadAlloc if
// either dimension cannot be represented by a 16-bit *signed* integer.
#define XLIB_IMAGE_SIDE_SIZE_LIMIT 0x7fff
if (size.width > XLIB_IMAGE_SIDE_SIZE_LIMIT ||
size.height > XLIB_IMAGE_SIDE_SIZE_LIMIT) {
return surface.forget();
}
SurfaceFormat format = aSurface->GetFormat();
Screen *screen = cairo_xlib_surface_get_screen(mSurface);
Display *dpy = DisplayOfScreen(screen);
XRenderPictFormat* xrenderFormat = nullptr;
switch (format) {
case SurfaceFormat::A8R8G8B8_UINT32:
xrenderFormat = XRenderFindStandardFormat(dpy, PictStandardARGB32);
break;
case SurfaceFormat::X8R8G8B8_UINT32:
xrenderFormat = XRenderFindStandardFormat(dpy, PictStandardRGB24);
break;
case SurfaceFormat::A8:
xrenderFormat = XRenderFindStandardFormat(dpy, PictStandardA8);
break;
default:
return surface.forget();
}
if (!xrenderFormat) {
return surface.forget();
}
Drawable pixmap = XCreatePixmap(dpy, RootWindowOfScreen(screen),
size.width, size.height,
xrenderFormat->depth);
if (!pixmap) {
return surface.forget();
}
auto closure = MakeUnique<DestroyPixmapClosure>(pixmap, screen);
ScopedCairoSurface csurf(
cairo_xlib_surface_create_with_xrender_format(dpy, pixmap,
screen, xrenderFormat,
size.width, size.height));
if (!csurf || cairo_surface_status(csurf)) {
return surface.forget();
}
cairo_surface_set_user_data(csurf, &gDestroyPixmapKey,
closure.release(), DestroyPixmap);
RefPtr<DrawTargetCairo> dt = new DrawTargetCairo();
if (!dt->Init(csurf, size, &format)) {
return surface.forget();
}
dt->CopySurface(aSurface,
IntRect(0, 0, size.width, size.height),
IntPoint(0, 0));
dt->Flush();
surface = new SourceSurfaceCairo(csurf, size, format);
#endif
return surface.forget();
}
already_AddRefed<SourceSurface>
DrawTargetCairo::CreateSourceSurfaceFromNativeSurface(const NativeSurface &aSurface) const
{
return nullptr;
}
already_AddRefed<DrawTarget>
DrawTargetCairo::CreateSimilarDrawTarget(const IntSize &aSize, SurfaceFormat aFormat) const
{
if (cairo_surface_status(cairo_get_group_target(mContext))) {
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
if (target->Init(aSize, aFormat)) {
return target.forget();
}
}
cairo_surface_t* similar;
switch (cairo_surface_get_type(mSurface)) {
#ifdef CAIRO_HAS_WIN32_SURFACE
case CAIRO_SURFACE_TYPE_WIN32:
similar = cairo_win32_surface_create_with_dib(
GfxFormatToCairoFormat(aFormat), aSize.width, aSize.height);
break;
#endif
#ifdef CAIRO_HAS_QUARTZ_SURFACE
case CAIRO_SURFACE_TYPE_QUARTZ:
similar = cairo_quartz_surface_create_cg_layer(
mSurface, GfxFormatToCairoContent(aFormat), aSize.width, aSize.height);
break;
#endif
default:
similar = cairo_surface_create_similar(mSurface,
GfxFormatToCairoContent(aFormat),
aSize.width, aSize.height);
break;
}
if (!cairo_surface_status(similar)) {
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
if (target->InitAlreadyReferenced(similar, aSize)) {
return target.forget();
}
}
gfxCriticalError(CriticalLog::DefaultOptions(Factory::ReasonableSurfaceSize(aSize))) << "Failed to create similar cairo surface! Size: " << aSize << " Status: " << cairo_surface_status(similar) << cairo_surface_status(cairo_get_group_target(mContext)) << " format " << (int)aFormat;
cairo_surface_destroy(similar);
return nullptr;
}
bool
DrawTargetCairo::InitAlreadyReferenced(cairo_surface_t* aSurface, const IntSize& aSize, SurfaceFormat* aFormat)
{
if (cairo_surface_status(aSurface)) {
gfxCriticalNote
<< "Attempt to create DrawTarget for invalid surface. "
<< aSize << " Cairo Status: " << cairo_surface_status(aSurface);
cairo_surface_destroy(aSurface);
return false;
}
mContext = cairo_create(aSurface);
mSurface = aSurface;
mSize = aSize;
mFormat = aFormat ? *aFormat : GfxFormatForCairoSurface(aSurface);
// Cairo image surface have a bug where they will allocate a mask surface (for clipping)
// the size of the clip extents, and don't take the surface extents into account.
// Add a manual clip to the surface extents to prevent this.
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, mSize.width, mSize.height);
cairo_clip(mContext);
if (mFormat == SurfaceFormat::A8R8G8B8_UINT32 ||
mFormat == SurfaceFormat::R8G8B8A8) {
SetPermitSubpixelAA(false);
} else {
SetPermitSubpixelAA(true);
}
return true;
}
already_AddRefed<DrawTarget>
DrawTargetCairo::CreateShadowDrawTarget(const IntSize &aSize, SurfaceFormat aFormat,
float aSigma) const
{
cairo_surface_t* similar = cairo_surface_create_similar(cairo_get_target(mContext),
GfxFormatToCairoContent(aFormat),
aSize.width, aSize.height);
if (cairo_surface_status(similar)) {
return nullptr;
}
// If we don't have a blur then we can use the RGBA mask and keep all the
// operations in graphics memory.
if (aSigma == 0.0f || aFormat == SurfaceFormat::A8) {
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
if (target->InitAlreadyReferenced(similar, aSize)) {
return target.forget();
} else {
return nullptr;
}
}
cairo_surface_t* blursurf = cairo_image_surface_create(CAIRO_FORMAT_A8,
aSize.width,
aSize.height);
if (cairo_surface_status(blursurf)) {
return nullptr;
}
cairo_surface_t* tee = cairo_tee_surface_create(blursurf);
cairo_surface_destroy(blursurf);
if (cairo_surface_status(tee)) {
cairo_surface_destroy(similar);
return nullptr;
}
cairo_tee_surface_add(tee, similar);
cairo_surface_destroy(similar);
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
if (target->InitAlreadyReferenced(tee, aSize)) {
return target.forget();
}
return nullptr;
}
static inline pixman_format_code_t
GfxFormatToPixmanFormat(SurfaceFormat aFormat)
{
switch (aFormat) {
case SurfaceFormat::A8R8G8B8_UINT32:
return PIXMAN_a8r8g8b8;
case SurfaceFormat::X8R8G8B8_UINT32:
return PIXMAN_x8r8g8b8;
case SurfaceFormat::R5G6B5_UINT16:
return PIXMAN_r5g6b5;
case SurfaceFormat::A8:
return PIXMAN_a8;
default:
// Allow both BGRA and ARGB formats to be passed through unmodified,
// even though even though we are actually rendering to A8R8G8B8_UINT32.
if (aFormat == SurfaceFormat::B8G8R8A8 ||
aFormat == SurfaceFormat::A8R8G8B8) {
return PIXMAN_a8r8g8b8;
}
return (pixman_format_code_t)0;
}
}
static inline bool
GfxMatrixToPixmanTransform(const Matrix4x4 &aMatrix, pixman_transform* aResult)
{
pixman_f_transform fTransform = {{
{ aMatrix._11, aMatrix._21, aMatrix._41 },
{ aMatrix._12, aMatrix._22, aMatrix._42 },
{ aMatrix._14, aMatrix._24, aMatrix._44 }
}};
return pixman_transform_from_pixman_f_transform(aResult, &fTransform);
}
#ifndef USE_SKIA
bool
DrawTarget::Draw3DTransformedSurface(SourceSurface* aSurface, const Matrix4x4& aMatrix)
{
// Composite the 3D transform with the DT's transform.
Matrix4x4 fullMat = aMatrix * Matrix4x4::From2D(mTransform);
// Transform the surface bounds and clip to this DT.
IntRect xformBounds =
RoundedOut(
fullMat.TransformAndClipBounds(Rect(Point(0, 0), Size(aSurface->GetSize())),
Rect(Point(0, 0), Size(GetSize()))));
if (xformBounds.IsEmpty()) {
return true;
}
// Offset the matrix by the transformed origin.
fullMat.PostTranslate(-xformBounds.x, -xformBounds.y, 0);
// Invert the matrix into a pattern matrix for pixman.
if (!fullMat.Invert()) {
return false;
}
pixman_transform xform;
if (!GfxMatrixToPixmanTransform(fullMat, &xform)) {
return false;
}
// Read in the source data.
RefPtr<DataSourceSurface> srcSurf = aSurface->GetDataSurface();
pixman_format_code_t srcFormat = GfxFormatToPixmanFormat(srcSurf->GetFormat());
if (!srcFormat) {
return false;
}
DataSourceSurface::ScopedMap srcMap(srcSurf, DataSourceSurface::READ);
if (!srcMap.IsMapped()) {
return false;
}
// Set up an intermediate destination surface only the size of the transformed bounds.
// Try to pass through the source's format unmodified in both the BGRA and ARGB cases.
RefPtr<DataSourceSurface> dstSurf =
Factory::CreateDataSourceSurface(xformBounds.Size(),
srcFormat == PIXMAN_a8r8g8b8 ?
srcSurf->GetFormat() : SurfaceFormat::A8R8G8B8_UINT32);
if (!dstSurf) {
return false;
}
// Wrap the surfaces in pixman images and do the transform.
pixman_image_t* dst =
pixman_image_create_bits(PIXMAN_a8r8g8b8,
xformBounds.width, xformBounds.height,
(uint32_t*)dstSurf->GetData(), dstSurf->Stride());
if (!dst) {
return false;
}
pixman_image_t* src =
pixman_image_create_bits(srcFormat,
srcSurf->GetSize().width, srcSurf->GetSize().height,
(uint32_t*)srcMap.GetData(), srcMap.GetStride());
if (!src) {
pixman_image_unref(dst);
return false;
}
pixman_image_set_filter(src, PIXMAN_FILTER_BILINEAR, nullptr, 0);
pixman_image_set_transform(src, &xform);
pixman_image_composite32(PIXMAN_OP_SRC,
src, nullptr, dst,
0, 0, 0, 0, 0, 0,
xformBounds.width, xformBounds.height);
pixman_image_unref(dst);
pixman_image_unref(src);
// Temporarily reset the DT's transform, since it has already been composed above.
Matrix origTransform = mTransform;
SetTransform(Matrix());
// Draw the transformed surface within the transformed bounds.
DrawSurface(dstSurf, Rect(xformBounds), Rect(Point(0, 0), Size(xformBounds.Size())));
SetTransform(origTransform);
return true;
}
#endif
#ifdef CAIRO_HAS_XLIB_SURFACE
static bool gXRenderInitialized = false;
static bool gXRenderHasTransform = false;
static bool
SupportsXRender(cairo_surface_t* surface)
{
if (!surface ||
cairo_surface_get_type(surface) != CAIRO_SURFACE_TYPE_XLIB ||
!cairo_xlib_surface_get_xrender_format(surface)) {
return false;
}
if (gXRenderInitialized) {
return true;
}
gXRenderInitialized = true;
cairo_device_t* device = cairo_surface_get_device(surface);
if (cairo_device_acquire(device) != CAIRO_STATUS_SUCCESS) {
return false;
}
Display* display = cairo_xlib_surface_get_display(surface);
int major, minor;
if (XRenderQueryVersion(display, &major, &minor)) {
if (major > 0 || (major == 0 && minor >= 6)) {
gXRenderHasTransform = true;
}
}
cairo_device_release(device);
return true;
}
#endif
bool
DrawTargetCairo::Draw3DTransformedSurface(SourceSurface* aSurface, const Matrix4x4& aMatrix)
{
#if CAIRO_HAS_XLIB_SURFACE
cairo_surface_t* srcSurf =
aSurface->GetType() == SurfaceType::CAIRO ?
static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface() : nullptr;
if (!SupportsXRender(srcSurf) || !gXRenderHasTransform) {
return DrawTarget::Draw3DTransformedSurface(aSurface, aMatrix);
}
Matrix4x4 fullMat = aMatrix * Matrix4x4::From2D(mTransform);
IntRect xformBounds =
RoundedOut(
fullMat.TransformAndClipBounds(Rect(Point(0, 0), Size(aSurface->GetSize())),
Rect(Point(0, 0), Size(GetSize()))));
if (xformBounds.IsEmpty()) {
return true;
}
fullMat.PostTranslate(-xformBounds.x, -xformBounds.y, 0);
if (!fullMat.Invert()) {
return false;
}
pixman_transform xform;
if (!GfxMatrixToPixmanTransform(fullMat, &xform)) {
return false;
}
cairo_surface_t* xformSurf =
cairo_surface_create_similar(srcSurf, CAIRO_CONTENT_COLOR_ALPHA,
xformBounds.width, xformBounds.height);
if (!SupportsXRender(xformSurf)) {
cairo_surface_destroy(xformSurf);
return false;
}
cairo_device_t* device = cairo_surface_get_device(xformSurf);
if (cairo_device_acquire(device) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy(xformSurf);
return false;
}
Display* display = cairo_xlib_surface_get_display(xformSurf);
Picture srcPict = XRenderCreatePicture(display,
cairo_xlib_surface_get_drawable(srcSurf),
cairo_xlib_surface_get_xrender_format(srcSurf),
0, nullptr);
XRenderSetPictureFilter(display, srcPict, FilterBilinear, nullptr, 0);
XRenderSetPictureTransform(display, srcPict, (XTransform*)&xform);
Picture dstPict = XRenderCreatePicture(display,
cairo_xlib_surface_get_drawable(xformSurf),
cairo_xlib_surface_get_xrender_format(xformSurf),
0, nullptr);
XRenderComposite(display, PictOpSrc,
srcPict, X11None, dstPict,
0, 0, 0, 0, 0, 0,
xformBounds.width, xformBounds.height);
XRenderFreePicture(display, srcPict);
XRenderFreePicture(display, dstPict);
cairo_device_release(device);
cairo_surface_mark_dirty(xformSurf);
AutoPrepareForDrawing(this, mContext);
cairo_identity_matrix(mContext);
cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
cairo_set_antialias(mContext, CAIRO_ANTIALIAS_DEFAULT);
cairo_set_source_surface(mContext, xformSurf, xformBounds.x, xformBounds.y);
cairo_new_path(mContext);
cairo_rectangle(mContext, xformBounds.x, xformBounds.y, xformBounds.width, xformBounds.height);
cairo_fill(mContext);
cairo_surface_destroy(xformSurf);
return true;
#else
return DrawTarget::Draw3DTransformedSurface(aSurface, aMatrix);
#endif
}
bool
DrawTargetCairo::Init(cairo_surface_t* aSurface, const IntSize& aSize, SurfaceFormat* aFormat)
{
cairo_surface_reference(aSurface);
return InitAlreadyReferenced(aSurface, aSize, aFormat);
}
bool
DrawTargetCairo::Init(const IntSize& aSize, SurfaceFormat aFormat)
{
cairo_surface_t *surf = cairo_image_surface_create(GfxFormatToCairoFormat(aFormat), aSize.width, aSize.height);
return InitAlreadyReferenced(surf, aSize);
}
bool
DrawTargetCairo::Init(unsigned char* aData, const IntSize &aSize, int32_t aStride, SurfaceFormat aFormat)
{
cairo_surface_t* surf =
cairo_image_surface_create_for_data(aData,
GfxFormatToCairoFormat(aFormat),
aSize.width,
aSize.height,
aStride);
return InitAlreadyReferenced(surf, aSize);
}
void *
DrawTargetCairo::GetNativeSurface(NativeSurfaceType aType)
{
if (aType == NativeSurfaceType::CAIRO_CONTEXT) {
return mContext;
}
return nullptr;
}
void
DrawTargetCairo::MarkSnapshotIndependent()
{
if (mSnapshot) {
if (mSnapshot->refCount() > 1) {
// We only need to worry about snapshots that someone else knows about
mSnapshot->DrawTargetWillChange();
}
mSnapshot = nullptr;
}
}
void
DrawTargetCairo::WillChange(const Path* aPath /* = nullptr */)
{
MarkSnapshotIndependent();
MOZ_ASSERT(!mLockedBits);
}
void
DrawTargetCairo::SetTransform(const Matrix& aTransform)
{
DrawTarget::SetTransform(aTransform);
mTransformSingular = aTransform.IsSingular();
if (!mTransformSingular) {
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(mTransform, mat);
cairo_set_matrix(mContext, &mat);
}
}
Rect
DrawTargetCairo::GetUserSpaceClip()
{
double clipX1, clipY1, clipX2, clipY2;
cairo_clip_extents(mContext, &clipX1, &clipY1, &clipX2, &clipY2);
return Rect(clipX1, clipY1, clipX2 - clipX1, clipY2 - clipY1); // Narrowing of doubles to floats
}
cairo_t*
BorrowedCairoContext::BorrowCairoContextFromDrawTarget(DrawTarget* aDT)
{
if (aDT->GetBackendType() != BackendType::CAIRO ||
aDT->IsDualDrawTarget() ||
aDT->IsTiledDrawTarget() ||
aDT->IsCaptureDT()) {
return nullptr;
}
DrawTargetCairo* cairoDT = static_cast<DrawTargetCairo*>(aDT);
cairoDT->WillChange();
// save the state to make it easier for callers to avoid mucking with things
cairo_save(cairoDT->mContext);
// Neuter the DrawTarget while the context is being borrowed
cairo_t* cairo = cairoDT->mContext;
cairoDT->mContext = nullptr;
return cairo;
}
void
BorrowedCairoContext::ReturnCairoContextToDrawTarget(DrawTarget* aDT,
cairo_t* aCairo)
{
if (aDT->GetBackendType() != BackendType::CAIRO ||
aDT->IsDualDrawTarget() ||
aDT->IsTiledDrawTarget()) {
return;
}
DrawTargetCairo* cairoDT = static_cast<DrawTargetCairo*>(aDT);
cairo_restore(aCairo);
cairoDT->mContext = aCairo;
}
#ifdef MOZ_X11
bool
BorrowedXlibDrawable::Init(DrawTarget* aDT)
{
MOZ_ASSERT(aDT, "Caller should check for nullptr");
MOZ_ASSERT(!mDT, "Can't initialize twice!");
mDT = aDT;
mDrawable = X11None;
#ifdef CAIRO_HAS_XLIB_SURFACE
if (aDT->GetBackendType() != BackendType::CAIRO ||
aDT->IsDualDrawTarget() ||
aDT->IsTiledDrawTarget()) {
return false;
}
DrawTargetCairo* cairoDT = static_cast<DrawTargetCairo*>(aDT);
cairo_surface_t* surf = cairo_get_group_target(cairoDT->mContext);
if (cairo_surface_get_type(surf) != CAIRO_SURFACE_TYPE_XLIB) {
return false;
}
cairo_surface_flush(surf);
cairoDT->WillChange();
mDisplay = cairo_xlib_surface_get_display(surf);
mDrawable = cairo_xlib_surface_get_drawable(surf);
mScreen = cairo_xlib_surface_get_screen(surf);
mVisual = cairo_xlib_surface_get_visual(surf);
mXRenderFormat = cairo_xlib_surface_get_xrender_format(surf);
mSize.width = cairo_xlib_surface_get_width(surf);
mSize.height = cairo_xlib_surface_get_height(surf);
double x = 0, y = 0;
cairo_surface_get_device_offset(surf, &x, &y);
mOffset = Point(x, y);
return true;
#else
return false;
#endif
}
void
BorrowedXlibDrawable::Finish()
{
DrawTargetCairo* cairoDT = static_cast<DrawTargetCairo*>(mDT);
cairo_surface_t* surf = cairo_get_group_target(cairoDT->mContext);
cairo_surface_mark_dirty(surf);
if (mDrawable) {
mDrawable = X11None;
}
}
#endif
} // namespace gfx
} // namespace mozilla
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